diff --git a/.gitignore b/.gitignore
index 88edb62..cccfc87 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 node_modules/
 lib/
+es/
diff --git a/package-lock.json b/package-lock.json
index 985e21c..fe023cf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@hibas123/utils",
-  "version": "2.2.3",
+  "version": "2.2.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 4e7bffa..cdbed55 100644
--- a/package.json
+++ b/package.json
@@ -1,12 +1,13 @@
 {
    "name": "@hibas123/utils",
-   "version": "2.2.6",
+   "version": "2.2.7",
    "description": "Different Utilities, that are not worth own packages",
    "main": "lib/index.js",
    "types": "lib/index.d.ts",
+   "module": "es/index.js",
    "scripts": {
-      "prepublishOnly": "tsc",
-      "build": "tsc",
+      "prepublishOnly": "npm run build",
+      "build": "tsc && tsc -p tsconfig.esm.json",
       "watch-ts": "tsc -w"
    },
    "author": "Fabian Stamm <dev@fabianstamm.de>",
diff --git a/src/awaiter.ts b/src/awaiter.ts
index 90aff1a..abcd4b1 100644
--- a/src/awaiter.ts
+++ b/src/awaiter.ts
@@ -1,4 +1,4 @@
-import Observable, { ObserverCallback } from "./observable";
+import Observable, { ObserverCallback } from "./observable.js";
 
 export type CheckFunction<T> = (val: T) => boolean;
 
diff --git a/src/index.ts b/src/index.ts
index f7e77c3..de7691c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,10 +1,10 @@
-import Lock, { Release } from "./lock";
+import Lock, { Release } from "./lock.js";
 import Observable, {
    ObserverCallback,
    ObserverCallbackCollect,
    ObservableInterface,
-} from "./observable";
-import AwaitStore from "./awaiter";
+} from "./observable.js";
+import AwaitStore from "./awaiter.js";
 
 export {
    Lock,
diff --git a/tsconfig.esm.json b/tsconfig.esm.json
new file mode 100644
index 0000000..346bc1d
--- /dev/null
+++ b/tsconfig.esm.json
@@ -0,0 +1,8 @@
+{
+   "extends": "./tsconfig.json",
+   "compilerOptions": {
+      "module": "ESNext",
+      "moduleResolution": "classic",
+      "outDir": "es"
+   }
+}